Taper attachment for lathes



Jan. 16, 1923.

W. F. GROENE. TAPER ATTACHMENT FOR LATHEs.

3 SHEETS-SHEET FILED MAY 20| 1921.'

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TAPER ATTACHMENT FOR LATHES.

FILED MAY 20,1921.

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WILL ll?. GROENEfOF CINCINNATI, OHIO, ASSGNOR T0 THE R. R. LE BLND MACHINE TOOL COMPANY, OIF CINCINNAE, QHIO, CRPORATEN 0F DELA- WARE.

TAPER ATTACHMENT FR LTHES.

rapplication iled May 20, i921. Serial No. .ll.

To all whom it may concern: p Be it known that l, WILLIAM F. GROENE,

.a citizen ofthe United States. residing at Cincinnati, county of Hamilton and State of 0h10, have invented an Improvement in 'laper Attachments for Lathes, of which the following description, in connection with the accompanying drawings, is a specification, like characters, on the drawings representing like parts.

This invention relates to taper attachments for lathes whereby the lathe tool may be moved either toward or from the centre of the lathe while at the same vtime it is moved toward an endof the lathe at a speed bearing a predetermined relation to its first-mentioned movement.

Taper attachments for lathes are used only when it is desired to perfom certain operations, and it is therefore desirable to construct the taper. attachment so that the lathe tool may be easily and quickly placed under the control of the same, and likewise may be easily and quickly release-d from the taper attachment and the parts restored to their normal operating condition.

liinparted'to the lathe tool.

ln taper attachments for lathes, it is customary to provide a taper rail which may be adjusted 'to diiferent angles, and to provide a. shoe having sliding engagement with the' rail, the arrangement being such that as the shoe is slid along .the inclined rail, it will move either toward or from the longitudinal axis of the lathe, and by suitable connections, this movement of the shoe is These sliding shoes usually fit tightly. upon the rail to prevent play from occurring therebetween, andr if the bearing surfaces of-theshoe and taper rail become dry or dirty, considerable `force is required to slide the shoe along the rail.

An 'important feature of the present invention, therefore, consists in a taper attachment which is so constructed that the cross-feed screw is entirely relieved from lateral bending forces throughout the movement of the shoe along the taper rail, and in which the cross-feed screw is also relieved from longitudinal stresses during the use of the tapermechanism.

Another feature of the invention consists goed, practical form of the invention, the details of which may be modiled within the true scope thereof, as defined by the claims.

ln the drawings Figure 1 is a. vertical transverse sectional view taken through the lathe bed and its carriage;

Fig. 2 is an enlarged plan vievvl of the taper attachment and a portion of the lathe;

F ig. 3 is a sectional View taken on the line y 3-3 of Fig. 2; and l Fig. 4 is a side view of the taper attachment looking to the right with respect to Fig. 2.

ln the drawings: 10 designates the lathe bed having the carriage 11 slidably mounted thereupon; and mounted upon the car riage is the cross-slide 12 which supports the tool-carrying mechanism 13. ylhe construction of these parts forms no part of the present invention, and they may be given' l the usual or any preferred embodiment.

In the present embodiment ol theinvention, a bracket lll is rigidly secured to theY rear face of the carriage 11 by suitable means such as bolts 15. The bracket le may serve to slidably support the bar 16 having the dove-tailed bearing surfaces 17, and upon the upper tace of the bar 16 is pivotally mounted the taper guide rail 18 pivotally secured to the bar 16 by the pin 19. Upon the guide-rail 18 is slidably mounted the shoe 20 preferably having a tapered spline 21 for taking up wear between the shoe and rail, and the bracket la may like- Wise be provided with a spline 22 engaging 'the bar 16.

is above pointed out, an importantfeature of the present invention consists in a construction in which the cross-feed screw is relieved from both lateral and longitudinal stresses while the taper attachment is in use,

` c.rosswise of the lathe, and the screw 23 is operatively secured to the slide by the nut 242 rigidly secured to the slide by any suitable Vmeans such as a boss 25 and nut 26. The

rear portion of the screw 23 is jonrnaled in a relatively long sleeve 27, and the screw is prevented from moving longitudinally Within the sleeve in one direction by the shoulder 23 upon the screw and the thrust bearing 29, while the screw is prevented from moving in the oppositedirectio-i relative to the sleeve by the thrust bearing 3 and nuts 31. A v

llhe sleeve 2l' in the embodiment shown is provided with an enlarged ring-like portion 32 and oppositely projecting end portions 33, as best shown in Fig. a. rlhe end portions 33 are slide-bly mounted in spaced bearings or guideways 34. the construction being such that the sleeve 27 is supported for sliding movement transversely of the lathe.

When the cross-feed screw 23 is rotated to feed the cross-slide 12 in either direction the tendency of "the screw to move in the direction of its length is resisted by the sleeve 27. lt is therefore important to provide means for firmly holding the sleeveI from being moved by the screw, and to this end, in the embodiment shown, the shoe 20 has a boss 35 extending upwardly therefrom, which is journaled in the ring-like portion 32 of the sleeve. By this construction the sleeve 27 is firmly connected to the-shoe 20 While relative rotation between the shoe and sleeve is permitted, and the sleeve is positioned in close proximity to the shoe, which desirably increases the rigidity of the connection therebetween.

In the embodiment of the invention illustrat-.edhthe bar 16 is provided at one end With a strap 36 secured thereto by a bolt 37,

and the other end of the 'strap is secured at 38 to a clamp 39 adapted to be secured to the lathe bed as at 40 by operating the bolt 41 to tighten the jaw 42 of the clamp (see Fig. 4). When it is desired to use the taper attachment, the clamp 39 is secured tothe lathe bed as shown in Figs: 2 and 4, then the shoe 20 Will be slid along the taper guide-rail 18 as the carriage -11 is moved toward or from the lathe head.\ Movement of the carriage 11 along the lathe bed is imparted to the shoe 20 by the sleeve 27, and since the ends of this sleeve are supported by the guide-Ways 34, it will be seen that the sleeve is Well adapted to withstand the stresses to which it may be subjected in imparting movement to the shoe. v

It is desirable to provide means for rigidly connecting the cross-slide to the shoe intenso 'the cross-slide 12 by a pin /14 and bolt 45.

1The slot 46 of the bar 13 is adapted to slidably receive the clamping bolt L17 having threaded engagement with the boss 35 of the shoe. The arrangementis such that the bar 1-3 may be rmly clamped against the upper tace or' the portion 32 of the sleeve by tightening the bolt a7 -to torce the clamp 43 against the opper face ci the bar 13, `infin-fijenpon the shoe 2O and bar e3, will be rigidly clamped the sleeve 27. Yfand when the parts in this position, the movement of.

the shoe tov/'ard or troni the longitudinal aL/is et the lathe will be imparted to the cross-slide 12 through the bar d3.

'lhe forward end 4l-9 of the cross-feed screv.v 23 is slidably received in a sleeve 50 and is secured thereto by a key 51. The sleeve 50 may be rotated by the handle 52, and this movement is imparted to the screivv 23 by the key 51, the construction being such that the screv7 is free to slide in the sleeve 50, when movement. is imparted thereto in the direction of vits length.

From the foregolng description it Will be apparent that the screw' 23 'is relieved from longitudinal stresses dnrinfr the use of the taper mechanism by tightening up the cla-mping' bolt t7 and it will also be a parent that since the sleeve 27 serves to slide the shoe' along the guide-rail, the screw 23 is also relieved from lateral stresses. Furthermore, by securing the sleeve 27 to both the crossfeed screw and the sliding shoe, a compact, strong, and durable construction is obtained.

Various means might. be provided for adjusting the taper rail 18 about the pivot pin 19 to the desired angle, and one means to this end consists in providing the rail 18 With a pinion 53 positioned to mesh With the rack 54: secured to the bar 16, so that When thepinion is rotated it Will travel along the' rack and impart angular movement tothe taper-rail. ln the embodiment shown, the pinion 53 is rigidly secured to the upwardly-extending shat't 55 mounted to rotate in a sleeve 56 mounted upon the rail 18, and at the 'upper end of the shaft 55 is provided a knurled Wheel 57 adapted to rotatethe shaft 55 and pinion 53. After the knurled wheel 57 has been rotated to adjust the taper-rail 18 to the desired position, the rail may be clamped in its position of adjustment by tightening the nuts upon the bolts 58.

In the embodiment shown, the boss :35 of the slidin shoe has a hole 59 formed therethrough, t 'rough Which the cross-feed screw 23 freely extends, and since the shoe is turned relative to the screw 23 when the lOl lli

stucco guide-rail 18 is moved to different angles, the hole 59 is tiered outward toward its ends to form suiicient clearance for the screw.

Fromthe oregoin description vlhen reed in connection with the drawings, it will be seen that the cross-feed screw 23 is at all times connected to the sliding shoe 20 by the sleeve 27, and that when it is desired to use the taper 'attachment kall that is necessary is to secure the clamp 39 to the lathe bed and to tighten the clamping bolts?.- lVhen it is no longer desired to use the taper attachment, all that is necessary is to release the clamping bolt 47 ahdtheclamp 39.

What is claimed is z Claims:

1. ln, a taper attachment for lathes, the combinltion of a lathe carrisge having a cross slide mounted thereupon and a guide- Way at the rear side of the carriage, e bracket secured to the carriage at the rear side thereof and having a guide-Way, a taper rail having a shoe slidahly mounted thereupon, a cross-feed screvv connected to the cross-slide and entendincr across saidshoe, a long sleeve having its ends slide-bly mounted in said guide-Ways and having the rear portion of the screw journeled therein, and means for pivotaily securing the sleeve to the shoe.

2. ln a taper attachment fior lathes, combination of a lethe-cerriage havin@ e cross-slide mountedthereupon, a secured to said carriage and huvinff a scid',- vvey extending; transversely et i taper reil, a sliding upon the rail positioned between said gui and front o' the lathe, a sleeve secured 1' shoe and slidably mounted in seid wey, und a cross-feed screw connected 'to the cross-slide end having an end giournuied in said sleeve and held from movement lood ily relative to tue sleeve.

3. ln a taper attachment for luthes,

combination or a lathe-cerriuge lieving o screw connected to the cross-slide, spaced' guide-Ways disposed transversely ,or the lathe at the rear side thereof, a. bracket secured to said carriage ,and supportingthe outer guide-way, a taper ruil, e sliding shoe s upon the rail and having s boss extending therefrom/"a screw-engaging slide slidebly vconnection therebetween, e cross-'tee connected to the cross-slide and hnving an wey, a har secured to said cross-slide, end o means for simultaneously clamping the screw-engaging slide and the bar to saidl shoe.

o. ln a taper attachment for lathes, the combination of a lathe-carriage having a cross-slide mounted thereupon, a bracket seu cured to said carriage end having o. guidevray extending transversely7 of* the lathe, a taper rail having a sliding shoe mounted thereupon, a sleeve slidably mounted in seid guide-way, a cross-feed screw connected said cross-slide and to sleeve, upon the shoe extending into said sleeve, n.2 har secured to the cross-slide, u

" with seid boss to sin il ove and bar to th i e teper etten@k AAL,

i earrings wey, u taper rail ha d thereupon, l in guide A s seid shoe, La er nested to seid cross-slide "f through sms-c rein, ineens o., to pivotally connect t li. ln s taper combination oi" a lathsce crossslide mounted thereuon, e ci, t secured to seid corriage und i guide@ "wey, a sleeve slidahly mov ted in seid guide-wey, a. taper rail, n slidably mounted on the taper rail end having` a hoes projecting into the sleeve to torni a pivotal connection therebetween, end o cross-feed screw-connected to the cross-slide hav# ing en end extending through .said loess "and 'sleeve and journaled in the latter.'

9. ln e taper ettachment tor lsthes, thev combination of a lathe-camia-ge having a cross-slide mounted thereu' on, a bracket secured to said carriage en having e. guidewey, a sleeve slidahly mounted in said guide-way, a taper ruil, e shoe -sliduhly mounted on the taper rail end having a boss projectinginto the sleeve to form e ivotsl4 screw ist end journaled in said sleeve, a bar secured to said cross-slide, and means for clamping said bar to said boss.

10. In a. taper attachment for lathes, the combination of a lathe carriage .having a cross-slide mounted thereupon, a taper rail having a shoe slidably mounted thereupon, a, cross-feed screw connected to the cross-Slide,

a sleeve mounted upon said shoe and havin an end of the cross-feed screw journale 10 therein, and a, guide for the sleeve having amend of the latter slidably mounted in the guide.

in testimony whereof, l have signed my naine to this specification. l

WILLIAM F. GROENE. 

